My card states you can only get the discount by calling the number on the card, NOT by choosing your item(s) via Priorityclub.com.
I called the number just for clarification on how many, what, when, etc. The rep stated as long as your redemptions are done on the same phone call, you can mix and match items, get multiple items of the same thing, etc and they will all get the 30% discount...but it only applies to that 1 time as Elite stated.